Update guestbook link image in index.html and links.html

- Replaced the guestbook button image with a new design in both index.html and links.html for a refreshed look.

index.html

@@ -13,7 +13,7 @@
         <br>
         <br>
         <img class="eeto" src="https://anlucas.neocities.org/under-con.gif" alt="Under Construction">
-        <a href="https://zaney.atabook.org/"><img class="eeto" src="https://cyber.dabamos.de/88x31/guestbook-button.gif"></a>
+        <a href="https://zaney.atabook.org/"><img class="eeto" src="https://zane.org/buttons/guestbook.gif"></a>
     </header>
     <div class="content">
         <h1 class="content">Welcome to my website :D</h1>

links.html

@@ -13,7 +13,7 @@
         <br>
         <br>
         <img class="eeto" src="https://anlucas.neocities.org/under-con.gif" alt="Under Construction">
-        <a href="https://zaney.atabook.org/"><img class="eeto" src="https://cyber.dabamos.de/88x31/guestbook-button.gif"></a>
+        <a href="https://zaney.atabook.org/"><img class="eeto" src="https://zane.org/buttons/guestbook.gif"></a>
     </header>
     <h1>Check out my internet neighbors!</h1>
     <p>These people are on the internet and have cool websites to link to on my website.</p>